Title :
Bias of feedback cancellation algorithms based on direct closed loop identification
Author :
Hellgren, Johan ; Forssell, Urban
Author_Institution :
Dept. of Neurosci. & Locomotion, Linkoping Univ., Sweden
Abstract :
An adaptive filter can be used to cancel the undesired acoustic feedback of hearing aids. The adaptive algorithm studied in this paper uses the output and input signal of the hearing aid to continuously track the acoustic feedback path. The bias of the optimal estimate with a quadratic norm is analyzed. The results show the importance of having a good model of the input signal to the hearing aid, as the error in this model will introduce bias in the estimate of the feedback path
Keywords :
acoustic filters; acoustic signal processing; adaptive filters; closed loop systems; feedback; hearing aids; identification; optimisation; adaptive algorithm; adaptive filter; direct closed loop identification; feedback cancellation algorithms bias; feedback path estimate; hearing aids; input signal model; optimal estimate; quadratic norm; undesired acoustic feedback; Adaptive algorithm; Adaptive filters; Auditory system; Delay estimation; Feedback loop; Filtering; Hearing aids; Neurofeedback; Output feedback; Signal processing;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 2000. ICASSP '00. Proceedings. 2000 IEEE International Conference on
Conference_Location :
Istanbul
Print_ISBN :
0-7803-6293-4
DOI :
10.1109/ICASSP.2000.859098
